Butcher&#39;s saw.



DISSTON. BUTOHERS SAW.

APPLICATION TILED NOV. 30, 1912- Patented Dec. 8, 1914.

.THE. NORRIS PETERS c0, PHOTa-UTHQ, WASHINGTON, A

UNITED STATES ParENroFFioE.

HENRY DISSTON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T HENRY DISSTON I PHILADELPHIA, PENNSYLVANIA, CORPORATION & soNs, INCORPORATED, or PENNSYLVANIA.

iacrcnnns saw.

Patented Dec. 8, 1914.

Application filed November 30, 1912. Serial No. 734,323.

To all whom it may concern: Be it known that I, HENRY DrssToN, a citizen of the United States, residing in. Philadelphia, Pennsylvania, have invented certain Improvements in Butchers Saws, of which the following is a specification.

One object of my invention is to improve the construction of butcher saws so that the blade of the saw willv be rigidly held in ponection with a hack saw or any saw having an open back with a detachable blade. I

In the accompanying drawingzFigure 1, is a side view of my improved butcher saw; Fig. 2, is a sectional View on the line 22, Fig. 1; Fig. 3,'is a sectional view on the line 33, Fig. 1; Fig. 4:, is a sectional plan view on the line :l 4c, Fig.1; and Figs. 5, 6 and 7, are detached perspective views illustrating details of the invention.

A is the handle of the saw.

B is the back. The rear portion of this back is inserted in the slot in the handle and secured therein by ordinary bolts. The depending rear portion of the back extends below the handle and secured to this extension of the back, by rivets c, is a socket O through which passes the threaded stem (Z of the rear attachment D. This rear attachment is made as clearly shown in Fig. 6, and has an extension d provided with a pin 6Z2 which passes through a hole e in the rear end of the saw blade E. The attachment is slotted at f for the reception of theextreme end of the blade which forms a tongue (Z so that When the blade is in position the attachment holds it rigidly against any motion on the pin d and prevents the blade from chattering when it is in use.

On the spindle (Z of the attachment is a pin f, which is adapted to slots 0 in the socket O, and on the end of the threaded parts are not liable to be lostspindle is a nut Fby which the slack is taken up.

The outer end of the back B is bent, as shown in Fig. 1, forming a portion B, and at the extreme end of this portion B is an extension Z) less in width than the portion B, and projecting from one surface of this extension is a pin 6. y

b is a slot at the base of the extension into which projects the back of the saw blade E.

when the pin 6 is passed through the hole 6 in the blade, so that the blade is rigidly held by means of the tongue 5 which extends over theface of the blade at the outer end.

When it is desired to substitute one blade for another, the nut is unscrewed and the attachment D loosened. The outer end of the sawblade E can be turned so as to withdraw it from under the tongue 6 at the forward end and can be raised so as to withdraw it from under the tongue d at the rear end. At the same time the blade is removed from the pins d and b.

In inserting a new blade the rear end of the blade is inserted under the tongue CF in the opening f and passed over the pin 03? and then the outer end of the blade is passed under the tongue 19 and over the pin b. The nut is then screwed up so as to place the desired tension on the blade, after which the saw is ready for use.

In this construction the attachment D need not be removed from the socket and the One blade can be quickly substituted for another as soon'as the edge of one blade becomes worn. Instead of riveting the socket to the rear end of the back B, it may be welded or secured by other means, if so desired.

I claim 1 I A. saw comprising a blade and a back, said back being turned down at the end transverse to the saw andthe lower end of the downturned portion being laterally cut-away throughout its width for a distance from the end less than the width of the saw blade, and the under portion of the shoulder formed by the cutting away of the downturned portion of the back being recessed in In testimony whereof, I have signed my continuation of the surface formed by the name to this specification, in the presence of cutting away to provide an opposing lip tWo subscribing Witnesses.

Which overhangs the side of the say; blade, HENRY DISSTON. whereby the outer end of the saw blade is I Witnesses:

permitted to be engaged or disengaged by E; B. ROBERTS, I

tilting on an axis longitudinally of the saw. W. C. BURKHOLDER.

Copies of this patent may be obtained of five cents each, by addressing the "Commissioner of Patents,

Washington, D. O. 

